<?php

    /**
     * PHPExcel_Shared_ZipStreamWrapper
     * Copyright (c) 2006 - 2015 PHPExcel
     * This library is free software; you can redistribute it and/or
     * modify it under the terms of the GNU Lesser General Public
     * License as published by the Free Software Foundation; either
     * version 2.1 of the License, or (at your option) any later version.
     * This library is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     * Lesser General Public License for more details.
     * You should have received a copy of the GNU Lesser General Public
     * License along with this library; if not, write to the Free Software
     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
     * @category   PHPExcel
     * @package    PHPExcel_Shared
     * @copyright  Copyright (c) 2006 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
     * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
     * @version    ##VERSION##, ##DATE##
     */
    class PHPExcel_Shared_ZipStreamWrapper {
        /**
         * Internal ZipAcrhive
         * @var ZipArchive
         */
        private $archive;
        /**
         * Filename in ZipAcrhive
         * @var string
         */
        private $fileNameInArchive = '';
        /**
         * Position in file
         * @var int
         */
        private $position = 0;
        /**
         * Data
         * @var mixed
         */
        private $data = '';

        /**
         * Register wrapper
         */
        public static function register() {
            @stream_wrapper_unregister('zip');
            @stream_wrapper_register('zip', __CLASS__);
        }

        /**
         * Implements support for fopen().
         * @param    string $path        resource name including scheme, e.g.
         * @param    string $mode        only "r" is supported
         * @param    int    $options     mask of STREAM_REPORT_ERRORS and STREAM_USE_PATH
         * @param    string &$openedPath absolute path of the opened stream (out parameter)
         * @return    bool    true on success
         */
        public function stream_open($path, $mode, $options, &$opened_path) {
            // Check for mode
            if ($mode{0} != 'r') {
                throw new PHPExcel_Reader_Exception('Mode ' . $mode . ' is not supported. Only read mode is supported.');
            }
            $pos             = strrpos($path, '#');
            $url['host']     = substr($path, 6, $pos - 6); // 6: strlen('zip://')
            $url['fragment'] = substr($path, $pos + 1);
            // Open archive
            $this->archive = new ZipArchive();
            $this->archive->open($url['host']);
            $this->fileNameInArchive = $url['fragment'];
            $this->position          = 0;
            $this->data              = $this->archive->getFromName($this->fileNameInArchive);
            return true;
        }

        /**
         * Implements support for fstat().
         * @return  boolean
         */
        public function url_stat() {
            return $this->statName($this->fileNameInArchive);
        }

        /**
         * Implements support for fstat().
         * @return  boolean
         */
        public function statName() {
            return $this->fileNameInArchive;
        }

        /**
         * Implements support for fstat().
         * @return  boolean
         */
        public function stream_stat() {
            return $this->archive->statName($this->fileNameInArchive);
        }

        /**
         * Implements support for fread(), fgets() etc.
         * @param   int $count maximum number of bytes to read
         * @return  string
         */
        public function stream_read($count) {
            $ret            = substr($this->data, $this->position, $count);
            $this->position += strlen($ret);
            return $ret;
        }

        /**
         * Returns the position of the file pointer, i.e. its offset into the file
         * stream. Implements support for ftell().
         * @return  int
         */
        public function stream_tell() {
            return $this->position;
        }

        /**
         * EOF stream
         * @return    bool
         */
        public function stream_eof() {
            return $this->position >= strlen($this->data);
        }

        /**
         * Seek stream
         * @param    int $offset byte offset
         * @param    int $whence SEEK_SET, SEEK_CUR or SEEK_END
         * @return    bool
         */
        public function stream_seek($offset, $whence) {
            switch ($whence) {
                case SEEK_SET:
                    if ($offset < strlen($this->data) && $offset >= 0) {
                        $this->position = $offset;
                        return true;
                    } else {
                        return false;
                    }
                    break;
                case SEEK_CUR:
                    if ($offset >= 0) {
                        $this->position += $offset;
                        return true;
                    } else {
                        return false;
                    }
                    break;
                case SEEK_END:
                    if (strlen($this->data) + $offset >= 0) {
                        $this->position = strlen($this->data) + $offset;
                        return true;
                    } else {
                        return false;
                    }
                    break;
                default:
                    return false;
            }
        }
    }
